کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1777707 | 1523674 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Perturbations of the upper atmosphere in the cleft region Perturbations of the upper atmosphere in the cleft region](/preview/png/1777707.png)
In the dayside polar region—loosely referred to as the cleft region—particle precipitation and Joule heating cause significant perturbations of the upper atmosphere. Here Dynamics Explorer-2 satellite data are used to present a synopsis of these disturbance effects. Documented are an increase in electron temperature and a decrease in electron density; increases in ion drift speed and ion temperature; an increase in the upward-directed ion velocity; increases in zonal wind speed and neutral gas temperature; and changes in the neutral gas composition and mass density. It is suggested that the increase in electron temperature is partly controlled by the decrease in electron density; that the ion upflow velocity mainly depends on the electron temperature, less frequently on the ion temperature; and that the observed decrease in thermospheric mass density is due to a decrease in the atomic oxygen density, which in turn is caused by diverging wind flows.
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 70, Issue 18, December 2008, Pages 2374–2380